以下为句子列表：
英文: A man who is careful in choosing friends will certainly derive benefit from them.
中文: 一个小心选择朋友的人一定会从他们那里获得益处。
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英文: A scheme is proposed to derive natural frequencies and modal functions of a beam under the given boundary conditions and moving axially at a constant speed.
中文: 提出在给定边界条件下确定一匀速运动梁固有频率和模态函数的方法。
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英文: A small signal analysis is presented to derive the positive and negative coefficients.
中文: 由小讯号分析可推导出正电源电压系数和负电源电压系数的公式。
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英文: A useful approach is: use the regression model based influencing factors of price-earnings ratio, including share of tradable shares, reveal the quantitative relationship between share of tradable shares and price-earning ratio, derive post-trade price-ea
中文: 解决非流通股估价问题的有益方法是：运用市盈率影响因素回归模型的非流通股估价方法，通过包含流通股比例及其它影响因素在内的市盈率模型中所揭示的流通股比例与市盈率的数量关系，推导出全流通后的市盈率，进而得到全流通后的股价，并推算出非流通股价格。
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英文: Abstract: In this paper,we derive predictive models of system and auxiliary system from double constant alterations respectively.The controller based on d-step ahead predictor can locate the closed loop poles at desired positions,whose parameters are adju
中文: 文摘:引入双恒等变换推导出系统及辅助系统的的d步预测模型，基于估计器的自校正控制器能将闭环极点配置在所希望的位置，它的参数是由与其相互独立的对象参数调节.提出使用辅助估计器克服丢番方程的病态问题.仿真表明在存在可测干扰的情况下该系统具有良好的动态性能.
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